A shorter command line to reproduce this with QEMU 2.11.0 and HelenOS 0.7.1 would be:
$ qemu-system-mips -cpu 4Kc -kernel HelenOS-0.7.1-mips32-malta-be.boot -nographic
A shorter command line to reproduce this with QEMU 2.11.0 and HelenOS 0.7.1 would be:
$ qemu-system-mips -cpu 4Kc -kernel HelenOS- 0.7.1-mips32- malta-be. boot -nographic